Maureen McCormick, who played Marcia on "The Brady Bunch," claims Eve Plumb, who played her sister Jan, is upset because McCormick claimed they had a lesbian affair on the set of the '70s sitcom.

McCormick, blogging this week on Fancast.com, said all six Brady "kids" were invited to re unite on the Oprah Winfrey show in September: "All of us said yes except for one person, Eve Plumb, who used to be my best friend but now apparently wants to distance herself from the show and, most troubling, from me ... I have no idea why, unless she's mad at the joke I made a few years ago that we'd had a lesbian love affair. I made the crack to be funny — and for shock value. I'm sorry if she took off ense."

McCormick "joked" about their sapphic sex last year just before her autobiography, "Here's the Story," was published. The "joke" made the book a best seller.

Plumb's agent, Mark Measures, downplayed any animosity: "No one from 'Oprah' called. We haven't turned down anything. There is no feud."